Matthew 21:22

And all things whatsoever ye shall ask in prayer, believing, ye shall receive. Believing, i.e., if ye shall believe and be confident that ye shall obtain those things from God, according to James 1:6. "Let him ask in faith, nothing doubting." See what is there said.

Well speaks S. Bernard (Serm. 15 in Psal. Qui habitat), expounding tropologically the words of God to Joshua, chap. i. "Whatsoever place your foot shall tread upon shall be yours." "Your foot," he says "is your faith, and let it go as far as it will, it shall obtain, if so be that it be fixed wholly upon God, that it be firm, and stumble not." The reason à priori is the liberality and munificence of God, which does not suffer itself to be surpassed by our hope, but far surpasses and transcends it.